Off gases

ABSTRACT

A METHOD FOR PRODUCING IMPROVED HIGH-ANALYSIS AMMONIUM POLYPHOSPHATE FERTILIZER SOLUTIONS OR SUSPENSIONS DIRECTLY FROM ORTHOPHOSPHORIC ACID AND ANHYDROUS AMMONIA BY SIMULTANEOUSLY INTRODUCING INTO A VESSEL SAID ORTHOPHOSPHORIC ACID AND SAID ANHYDROUS AMMONIA; MAINTAINING IN THE VESSEL A RESULTING MELT OF AMMONIUM POLYPHOSPHATES; CONTINUOUSLY AGITATING THE MELT OF AMMONIUM POLYPHOSPHATE AND CAUSING THE INTIMATE MIXING OF THE INCOMING STREAMS OF ORTHOPHOSPHORIC ACID AND ANHYDROUS AMMONIA WITH THE MELT; WITHDRAWING FROM THE VESSEL A PORTION OF THE MELT OF AMMONIUM POLYPHOSPHATES AND INTRODUCING IT INTO A SOLUTION TANK, TOGETHER WITH A STREAM OF AQUEOUS MEDIUM; SIMULTANEOUSLY INTRODUCING INTO THE SOLUTION TANK THE OFF GASES FROM THE VESSEL CONSISTING OF STEAM AND UNREACTED AMMONIA; CONTINUOUSLY AGITATING THE RESULTING FERTILIZER SOLUTION OR SUSPENSION IN THE SOLUTION TANK; AND WITHDRAWING A PORTION OF THE RESULTING SOLUTION OR SUSPENSION AS PRODUCT, SAID PRODUCT CHARACTERIZED BY THE FACT THAT IT CONTAINS, IN ADDITION TO AMMONIUM ORTHOPHOSPHATE, SUBSTANTIAL PORTIONS OF AMMONIUM PYROPHOSPHATE, AMMONIUM TRIPOLYPHOSPHATE, AND AMMONIUM POLYPHOSPHATES MORE HIGHLY CONDENSED THAN AMMONIUM TRIPOLYPHOSPHATE.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 2, 1971 Int. Cl. C05]: 7/00, 21/00 U.S. Cl. 71-34 2 Sheets Drawing. 19 Pages Specification I 4 ORTHOFHOSFHORIC 5 NH;

ACID 2 5 OFF eases mn,,srum

cc 15v I [7d AMMONIUM PDLYPMOSHiATE MELT mien m1, (OPTIONAL) o a AMMONIUM POLYPHDSFHATE SOLUTION DIRECT PRODUCTiON OF AMMONiUM POLYPHOSPHATE SOLUTION FROM ORTHOPHOSPHORIC ACID A method for producing improved high-analysis ammonium polyphosphate fertilizer solutions or suspensions directly from orthophosphoric acid and anhydrous ammonia by simultaneously introducing into a vessel said orthophosphoric acid and said anhydrous ammonia; maintaining in the vessel 2. resulting melt of ammonium polyphosphates; continuously agitating the melt of ammonium polyphosphate and causing the intimate mixing of the incoming streams of orthophosphoric acid and anhydrous ammonia with the melt; withdrawing from the vessel a portion of the melt of ammonium polyphosphates and introducing it into a solution tank, together with a stream of aqueous medium; simultaneously introducing into the solution tank the off gases from the vessel consisting of steam and unreacted ammonia; continuously agitating the resulting fertilizer solution or suspension in the solution tank; and withdrawing a portion of the resulting solution or suspension as product, said product characterized by the fact that it contains, in addition to ammonium orthophosphate, substantial portions of ammonium pyrophosphate, ammonium tripolyphosphate, and ammonium polyphosphates more highly condensed than ammonium tripolyphosphate.

j Feb. 2, 1971 Filed June 11, 1970 J. M. PQTTS Prionucwxou 0F AMMONIUM POLYPHOSPHATE SOLUTION 2 SheetsSheet 1 ORTHOPHOSPHORIC ACID' OFF GASES m (NH STEAM) AMMONIUM POLYPHOSPHATE SOLUTION F 1 DIRECT PODUCTION OF POLYPHOSPHATE SOLUTION FOM ORTHOPHOSPORIC AGED 

